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We hope that this web publication will in some small measure reflect the excitement of the RHIC and AGS program at Brookhaven, as explained by some of the people who are doing the experiments, analyzing the data, and writing the papers.
Wave Function Collapse During ρ0 Photoproduction in STAR
By Spencer Klein, Lawrence Berkeley National Laboratory
The phrase "relativistic heavy-ion collisions" usually brings to mind violent interactions and complex, 1000-particle final states. However, some RHIC collisions are the exact opposite - the colliding ions act as point sources of fields; the fields interact to produce a few-particle final state, leaving the relativistic nuclei intact. This happens at large impact parameters, where the nuclei do not interact hadronically; these are ultra-peripheral collisions (UPCs). More...